V2X Message Class Selection for Cooperative Driving Channel Load
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Solution Overview
Problem
V2X message transmission in connected vehicles can lead to channel bottlenecks, instability, and unreliability due to excessive communication demands, posing challenges for cooperative driving systems.
Innovation Solution
A management system that determines a channel busy ratio and selects appropriate message classes based on factors like conflict, occlusion, and vulnerability factors to optimize V2X message transmission, preventing channel overload and ensuring reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicles transmit more V2X messages to improve cooperation and situational awareness, then the quality of cooperative driving service is improved, but the V2X channel becomes bottlenecked and less useful
Solution Approach 1:
The system dynamically changes message transmission parameters (frequency, data rate, message type) based on channel conditions and traffic scenarios. When channel load is high, the system reduces transmission frequency or switches to aggregated messages. When channel conditions are good and safety is critical, the system increases transmission rate. This adaptive parameter adjustment resolves the contradiction by optimizing the balance between service quality and channel reliability.
Solution Approach 2:
The message management system implements dynamic control of V2X message transmission based on real-time channel busy ratio and traffic situation. The system continuously monitors channel conditions and adjusts message transmission strategies accordingly, transitioning between different transmission modes (frequent transmission, aggregated transmission, or suppressed transmission) to maintain both service quality and channel reliability under varying conditions.
2Loss of information
If V2X messages include rich data sets describing the roadway environment, then situational awareness about the roadway environment is improved, but communication resources are consumed and V2X channels are congested
Solution Approach 1:
The system segments message content into different priority levels and types (safety-critical information, cooperative maneuvering information, perception information). Only necessary segments are transmitted based on current traffic conditions and channel capacity. For example, in high-risk scenarios, only essential safety information is sent, while detailed environmental descriptions are omitted or aggregated, reducing resource consumption while maintaining critical situational awareness.
Solution Approach 2:
The system transmits partial information sets based on the specific traffic scenario and channel conditions rather than always transmitting complete rich data sets. When channel resources are constrained, the system transmits only the most critical portions of environmental information needed for safe operation, accepting partial situational awareness in exchange for reduced resource consumption and avoided channel congestion.
3Reliability
If V2X messages are transmitted frequently to maintain channel reliability, then communication reliability is improved, but channel congestion increases and instability occurs
Solution Approach 1:
Instead of continuous frequent transmission, the system implements periodic transmission intervals adapted to channel conditions and traffic scenarios. Transmission occurs at regular intervals when channel load is low and safety allows, reducing overall channel traffic and preventing congestion. When safety requires more frequent updates, the periodic interval is shortened temporarily, then returns to normal rhythm, maintaining reliability while avoiding sustained high-load conditions that cause instability.
Data Source
AI summary
The disclosure includes embodiments for message management by an ego vehicle for a Vehicle-to-Everything (V2X) channel used in V2X messages for providing a cooperative driving service. In some embodiments, the method includes receiving a first V2X message including remote sensor data recorded by a remote vehicle. The method includes causing an onboard sensor set of the ego vehicle to record ego sensor data. The method includes determining a channel busy ratio of the V2X channel. The method includes determining a set of factors affecting a state of a recipient vehicle that receives a second V2X message. The method includes selecting a cooperation message species class and an aggregation message species class of the second V2X message based on the set of factors and the state of the recipient vehicle. The method includes selecting, from a set of available classes, a specific class of the second V2X message.